Firearm



Oct. 23, 1945. c. c. LooMls 2,387,669

FIREARM Filed July 1'7",A 1943 f2 @1' f@ @mf/ v VENT R ERAWFURD Dummla.

@glia ATTORNEY Patented Oct. 23, 1945 UNITED STATES PATENT," 1 ,f fv'1"Y f .2,387,669 g FIREARM Crawford C., Loomis, Ilion, N. Y., assignerto Remington Arms Company, Inc., Bridgeport,

Conn.,la corporation of Delaware Application July 17, 1943,Seria1.No.495,164

4 Claims.

" 'I'he present inventonrelates to an improvementzin firearms, andparticularly to the safety mechanism for locking and releasing the firecontrol mechanism thereof. An object ofthe inventionis to vprovide asafety mechanism having an adjustable mounting within the receiver ofthe whereby the cooperative engagement between the safety member of themechanism and `the trigger may be accurately adjusted to secure propercorrelation between them, 'in order tov insure the reliable functioningof the firearm, and wherein such adjustment and precision relation maybe accomplished Without regard to the accuracy or iit `of other relatedVparts of the re control mechanism.

"The invention is especially adapted for use in ajriiie structurewherein the receiver-is in the form of a formed sheet metal member ofrelatively inexpensive manufacture,y and wherein the lirecontrol-mechanism consists of several stamped parts having spacedconnection and mounting points. In this type of iirearm structure thecumulative error, due to the added tolerances between the severalassociated parts and their connection and mounting points, produces arelativelywide range of variation at the point of correlation betweenthe safety member and the trigger;` Under present practice no adjustmentis provided in the correlation between the safety member and thetrigger, except through selective assembly. According to this practicethe safety membersare purposely'made in lots of variousl sizes, i. e.,the cam lobes that block the trigger are disposed at different radialdistances from the center, the safety members being carefully gauged andsegregated into lots according to size. In assembly a Astandard ormedian safety member is inserted in place and completely assembled withits cooperating parts in working correlation. This serves as a trialassembly and may or may not fall within the required tolerance. Inasmuehas no means is available for determining the required size of the safetymembei prior to this trial assembly, avery consid- Aerable'number ofthese assemblies have to be disassembled on account of improperly ttingsafety members. Under such circumstances, another safety Vmember isselected and the complete assembly vof these `partsl gone through withthe possibilityl 'that the second selection will not fall withinA therequired limits. Considerable time is consumed in disassembling andreassembling these parts, and although a precision correlation betweenthem is highly desirable, because of the 'criticar-function involved,the inherent cost in the quantity production of 4lor-w cos-tli-rearms'prohibits fitting these parts Within V-very closelimits;

Itis proposed according to the present inven-4 tion to provideadjustment means in the form of an eccentric bushing adaptedto be turnedafter the parts are assembled in working correlation, to precisely'position the safety member in Afitting relation with the trigger, thebushing being thereupon fixed in its adjusted position. According to theinvention safety members of a single standard size may be produced, andthrough lthe adjustable mounting made to precisely t in correlation withfirearm assemblies having a wide range of tolerance variation.

A further object is to provide a safety mechanism which may bereadjusted after long use of the iirearm in order to compensate .forwear of the Darts.

With the above and other objects in view, an embodiment of the inventionis shown 'in the accompanying drawings, and this` embodiment will behereinafter more fully described with Vreference thereto, and theinvention will be iinally pointed out in the claims.

In the drawing:

Fig. 1 is a side elevation, partially broken away',` of the receiverportion of a firearm embodying a safety mechanism according to theillustrated exemplary embodiment of the invention.l Y

Fig. 2 is a detail side elevation, on an enlarged scale, of the safetymechanism mounted in the receiver.

Fig. 3 is an end elevation.

Fig. 4 is a transverse vertical sectional view, taken along the line 4 4of Fig. 2.

Fig. 5 is a perspective VKview showing the several parts of the safetymechanism in separated relation.

Similar reference characters indicate corresponding parts throughout theseveral iigures of the drawing.

Referring to the drawing the firearm, illustrated by way of example andembodying the safety mechanism of the invention, comprises a receiverI0, in the form of a formed sheet metal part having a lower longitudinalportion of U- shape in cross-section and an upper longitudinal portionof cylindrical form in cross-section, the gun stock Il being secured tothe lower side and to the ends of the receiver and the barrel i2 beingsecured within the forward end of the upper cylindrical portion thereof.Within the upper portion of the receiver is engaged the reciprocatingbolt I3, the operating handle I4 of which Vis engaged in acircumferential and longitudinal slot formation l5 in the receiver, thebolt being provided with a longitudinal spring-actuated firing pin I6adapted to be cocked in the usual manner through operation of the bolthandle. The ring pin is provided in its under side with a shoulderednotch l1 which is engaged in the cocked position by the nose I8 of a.sear I9, of bell-crank form pivotally mounted at its end upon apivotscrew member screwed into a threaded hole 2l in the side wall of thereceiver. The sear is pivotallyv connected by a pivot screw 22 to theinner end* signed to engage the extension portion 26 of the triggerrearwardly of the detent pin 29 to hold the trigger down when the safetymechanism is in itson or safe position. When in this position, the lobeof the cam comes up against the detent pin 29, which is spring drgedagainst the periphery of the safety member to respectively engage of thetrigger 23, the latter being provided with j a cross shaft 24pivot-,ally engaged at its ends in pivot bearing holes 25 in the" sidewalls of the receiver. The trigger is provided with a rearward extension26 for. cooperation with the safety mechanism, the iinger .piece 21 ofthe trigger extending downwardly from this extension and being providedwith a cylindrical bore 28 in which is engaged a detent pin 29, normallypressed outwardly by means of a spring 30.within the borebeneaththepin.L Y

The parts of the fire control mechanism thus far described include thereceiven. the sear, the trigger, and the connection and mounting Ameansfor securing these parts in assembled relation. 'Ihe added tolerances ofthese several parts and their mounting and connection means mayv produceconsiderable variation in the pointofc'orrelation between the triggerand the safety mechanism cooperating therewith, and the safety mechanismaccording to the invention has for its purpose the compensating byadjustment for such` variation.

In one side wall of the receiver, the rightfh'and wall, as shown inFigs. 3 and 4, there is provided a cylindrical bearing aperture3|,vhaving its axis along a transverse line inspaced relationsubstantially directly above the detent pin 29 of the trigger, and inthe opposed side wallthere is provided a cylindrical threaded aperture32, the axis of which is forwardly offset from Ythe axis of the bearingaperture 3|. The safety 'mechanism, which is mounted in relationto-theseapertures, comprises a safety cam member 33 adapted to be positionedrsubstantially inY the central vertical plane of., thel receiver (incor-rela.- tion with the detent pin of thetriggen-being provided at oneside with ahub'including la cylindrical spacer portion '34, a bearing`portion of reduced diameter for engagement lir'ilthe aperture 3l, and alever mounting neck portion 36 of further reduced diameter for receivingthe actuating lever 31, Vthe neck portion being provided withdiametrically vdisposed slots-38 engaged by lugs 33 in the aperture 40of, the'plever to rigidly connect the lever to the safetycam member. Thesafety cam member isprovided with an axial bore 4|, in its outerportion. i

A retaining shaft member 43 is engaged "and projected through the boreofthe cam, member, being provided at its outerend witlna head1-44',

having screw threads 42 for clamping engagement withV` the lever 31, and

4adjacent the head with a screw portiorfi45'foren--` thenotches 50 and5|;therein to hold'the safety in the on 'or off positions.

Suiiicient clearance is provided in the engagemen-t of the necked hub ofthe safety member with the bearing aperture 3l, and of the shaft member43 with the bearing aperture 41 of the eccentricbushing 46, to permitslight necessary angular movement of the safety member and its shaft.Upon assembly of the parts the eccentric bushing is positioned so thatthe bearing aperture 41 is along the median horizontal diameter of theeccentric member substantially as shown in Fig. 2, and thereuponthroughturning, the eccentric member the position of the safety cam maybe adjusted upwardly or downwardlythrough any part of to the exact pointwhereitis in proper fitting correlation with thel 'trigger. When thisrelation is found the eccentric bushing it staked, as at 52, to maintainthe adjusted position of the safety member. Should the parts become wornafter extensive use the safety meinber may be reset simply by breakingthe staking point between the eccentric bushing and th receiver Itopermit of readjustment. l

The form of the invention illustratedin the drawing and described hereinis typical and illus-v trative only, and it is evident that theinvention is capable of embodiments in other forms, all falling withinthe scope of the appended claims, which are to be broadly construed. Y

What is claimed is: l l. In a firearm comprising a Yreceiver containinga firing mechanism havinga sear operating trigger, safety means forblocking andireleasing the action of said trigger comprising a safetycam member having rotatable bearing support in said receiver at oneside, and an eccentric vbushing adjustably engaged in said receiver andconstitutif ing a bearing support vfor, said safety member at the otherside, relative rotary adjustment of said eccentric bushing adapted tomove saidjsafety member to establish its proper Ycorrelationywith saidtrigger. f Y 2. In a firearm comprising a receivercontaining a ringmechanism having asear operating trigger, safety means for blocking andreleasing the action of the trigger comprising a safetybam member havingrotatable bearing supportin said receiver at one side, a retainingscrew-shaft engaged through said cam member having a bearing endprojecting into relation with the receiver at the other-side, and aneccentric bushing Yad-,-` justably engaged in said receiverhaving anYeccentric bearing constituting a bearing support for said bearing end ofsaid shaft, relative Arotaryjacl'- justment of saideccentric ,bushingVbeing adapted to move said safety member to establish itsfpropercorrelation withrsaid trigger. I j] -e 3. In a firearm comprisingYareceiver containing a firing mechanism having a Aserar operatingtrigger, safety means for blocking and Yreleasing the actionV ofthetrigger-comprising a safet'yfcam member having rotatable bearingsupport in said receiver at one side, a retainingscrewlshaft erigagedthrough said Acam member havinga bearing end projecting into relationwith the Kreceiver at the other side, and an "eccentric-bushingadjustably engaged in said receiver having an eccentric bearingconstituting a bearing support for said bearing end of said shaft,relative rotary adjustment of said eccentric bushing being adapted tomove said safety member to establish its proper correlation with saidtrigger, the bearing engagement of said safety cam member and shaft insaid receiver and bushing having sufficient clearance to permit ofnecessary angular movement during adjustment.

4. In a firearm, the combination comprising a receiver; a triggermechanism mounted in said receiver; a safety mechanism cooperating withsaid trigger mechanism and comprising a rotatabie shaft member; andmeans for` adjusting said safety mechanism with respect to said triggermechanism to compensate for variations in .the sizes thereof comprisinga circular bushing threaded into said receiver and provided With aneccentrically positioned opening forming a bearing for said shaftmember.

CRAWFORD C. LOOMIS.

